Quarterly report pursuant to Section 13 or 15(d)

Note 9 - Share Capital (Details Textual)

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Note 9 - Share Capital (Details Textual) - USD ($)
 3 Months Ended 5 Months Ended 10 Months Ended 12 Months Ended 14 Months Ended
Jun. 08, 2018
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2019
Dec. 31, 2017
Dec. 31, 2018
May 30, 2018
Mar. 28, 2018
Oct. 27, 2017
Payments of Stock Issuance Costs   $ 5,000                
The 2018 Purchase Agreement [Member]                      
Stock Issuance Program, Authorized Amount                 $ 20,000,000    
Stock Issued During Period, Shares, New Issues 170,261 3,259,955                  
Payments of Stock Issuance Costs $ 600,000                    
Shares Issued, Price Per Share   $ 1.84     $ 1.84 $ 1.84          
Proceeds from Issuance of Common Stock   $ 6,000,000     $ 7,900,000            
Proceeds from Issuance of Common Stock, Net   6,000,000   $ 7,900,000            
The 2017 Purchase Agreement [Member]                      
Stock Issuance Program, Authorized Amount                     $ 15,500,000
Stock Issued During Period, Shares, New Issues             357,143        
Proceeds from Issuance of Common Stock       $ 9,400,000              
Proceeds from Issuance of Private Placement             $ 500,000 $ 15,500,000      
Proceeds from Issuance of Private Placement, Net             $ 324,000        
Stock Issued During Period, Shares, Issued for Services             321,429        
Proceeds from Issuance of Common Stock, Net   8,860,000                
The 2018 ATM Offering [Member]                      
Stock Issuance Program, Authorized Amount                   $ 30,000,000  
Stock Issued During Period, Shares, New Issues   77,349                  
Shares Issued, Price Per Share   $ 2.37     $ 2.37 $ 2.37          
Proceeds from Issuance of Common Stock   $ 183,000       $ 11,200,000          
Proceeds from Issuance of Common Stock, Net   $ 178,000     $ 10,900,000          
Stock Issuance, Percent of Cash Commission to Issuer                   3.00%